******************************************************************** UARS WEEKLY STATUS REPORT - 28 Feb 2003 ******************************************************************** *********** SOLSTICE *********** Nothing received. *********** SUSIM *********** SUSIM successfully gathered all of its daily mid resolution, weekly offset, and occultation scans during periods of UARS telemetry. *********** ACRIM *********** Nothing received. *********** PEM *********** Nothing received. *********** HALOE *********** For the past several months the HALOE Project experienced operational processing failures on occasional scans. The problem has been traced to data packets arriving at PACOR-A out-of-order, causing discontinuities in the times associated with the data stream. The data transmission problem seems to have been fixed. We have been able to process that last 21 days of HALOE data with only one failure. We continue to work on the source of remaining failures. Thanks to those persons at PACOR-A and the UARS Project for looking into the problem. *********** MLS *********** Nothing received. *********** HRDI *********** Nothing received. *********** WINDII *********** Nothing received. *********** MPG *********** The MPG continues to serve as the point-of-contact for UARS instrument operations in support of the Science Traceability Mission of UARS. The DECNET communications circuit between the UARS Command Management System (CMS) and the Remote Analysis Computers (RACS) was restored to service on 21 February 2003. Normal processing of instrument Daily Activity Plans resumed this week and continues with no problems. *********** CDHF *********** Nothing recieved. *********** FOT *********** REPORTING PERIOD This report covers 15 February 2003 (Orbit 62518, GMT Day 046) through 21 February 2003 (Orbit 62623, GMT Day 052). SPACECRAFT OPERATION The observatory is now in Forward Flight (Southern Hemisphere viewing) and is performing nominally under two-battery operations. The instrument operational changes were: INSTRUMENT OPERATIONAL CHANGES Instrument Time Orbit Comment PEM 046/1256 62526 AXIS POWER ON The beta angle ranged between the angles of 42.3 degrees to 29.7 degrees for this report period. The beta angle is now decreasing towards a minimum angle of 0 degrees on 01 March 2003 (DOY 060). Spacecraft battery 1, 2, and 3 performance monitoring continues. Battery 1 remains OFF the charge relay. Battery 2 and Battery 3 are currently maintaining greater than 23.6 V end-of-night (EON) load bus voltage. Battery temperatures are stable with a temperature delta between Battery 2 and Battery 3 of 1.28 to 1.29 degrees C. Additional battery performance data for each battery on 14 February and 21 February 2003 are provided in Appendix D. The clock error ranged from -10.0 to 9.1 msec during this report period. Clock rate adjustments are listed in Appendix C. All instrument and subsystem engineers were advised on the initial excursion of ALERTS or Out-Of-Limits conditions detected by the FOT for this report. A summary is listed below and the details of ALERT and Out-Of-Limits occurrences are listed in Appendix B. OUT-OF-LIMITS = 00 ALERTS = 00 The following real-time command sheets were executed for the listed operational element(s) during this report period (see Appendix A). FOT = 01 PEM = 01 UARS Anomaly Reports initiated during this report period are listed in Appendix E and summarized below. FOT = 03 Four (4) Anomaly Report remained OPEN at the end of this report period (see Appendix E). GROUND SYSTEM OPERATION Three (3) operational support problems occurred this period. Anomaly Reports are included in Appendix E. The data loss calculations are no longer being supplied by Data Capture Facility (DCF). OTHER SIGNIFICANT EVENTS UARS SATELLITE OPERATIONS During the re-investigation of the OBC Halt Anomaly the FOT found that during the anomalous pass, the HRDI load was sent with 30 additional commands pre-pended to the load. A bit bust of these commands showed that one of these commands was a Select Fixed Bank 13 command, which immediately brought the OBC offline. These commands were generated by Eclipse due to a bug in the "cmdprt.exe" code. The bug has been fixed and a patch was tested and installed on the operational systems on 11 February 2003. The FOT is now in the process of revising the Anomaly Investigation Report. MEETINGS -None this report period FUTURE SIGNIFICANT EVENTS The next UARS Yaw slew is scheduled for 01 March 2003 (DOY 060). This maneuver will be a Forward to Reverse Flight maneuver (Northern Hemisphere viewing). Attachments: Appendix A, Real-time Command Sheets Appendix B, Out-Of-Limits & ALERT Occurrences Appendix C, Clock & Solar Array Rate Corrections Appendix D, UARS Battery Performance Data Appendix E, UARS Anomaly Reports APPENDIX A REAL-TIME COMMAND SHEETS Week ending 21 February 2003 ORBIT AOS NO. SUBSYS REASON ----- --- --- ------ ------ 62526 046/1256 03-041 PEM AXIS POWER ON 62531 046/2122 03-042 OBC/CLK CLK ADJ FR 20.6 TO 0.0 MSEC/DAY APPENDIX B OUT-OF-LIMITS & ALERTS OCCURRENCES Week ending 21 February 2003 The following Out-Of-Limits occurrences were detected: MNEMONIC STATE DESCRIPTION ORBITS -------- ----- ----------- ------ -None this report period. The following ALERT occurrences were detected: MNEMONIC DESCRIPTION ORBITS -------- ----------- ------ -None this report period. APPENDIX C CLOCK & SOLAR ARRAY RATE CORRECTIONS Week ending 21 February 2003 CLOCK DRIFT RATE ADJUSTMENTS ORBIT TIME CLOCK RATE CHANGE ----- ----- ----------------- 62531 046/2147 CLK ADJ FR 20.6 TO 0.0 MSEC/DAY APPENDIX D UARS BATTERY PERFORMANCE DATA Week ending 21 February 2003 14 February 2003 - GMT Day 045 Beta = 43.1 deg, SA Pos = 269 deg DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%) --- ------- -------- ---------- ----- ------- ------ 1 -168.0/-190.4 -3.05/-4.31 +00.0/+00.0 08.3 0.000 0.0 2 +11.2/-39.2 +5.47/+3.87 +26.8/-15.2 25.8 1.020 20.4 3 +22.4/-33.6 +4.51/+2.92 +25.6/-14.8 25.8 1.020 20.2 21 February 2003 - GMT Day 052 Beta = 29.7 deg, SA Pos = 269 deg DIFF V (mV) TEMP (C) CURR (amp) EON V AVE C/D AVE BAT MAX/MIN MAX/MIN MAX/MIN MIN RATIO DOD(%) --- ------- -------- ---------- ----- ------- ------ 1 -168.0/-190.4 -3.05/-3.99 +00.0/+00.0 08.3 0.000 0.0 2 +44.8/-22.4 +6.44/+5.15 +28.8/-15.2 23.8 1.040 22.5 3 +22.4/-67.2 +5.47/+4.19 +28.4/-15.6 23.7 1.030 22.0 V/T LEVEL CHANGES ORB# AOS TIME LVL FR-TO ----- -------- --------- -None this report period. APPENDIX E UARS ANOMALY REPORTS Week ending 21 February 2003 NEW ANOMALY REPORTS GENERATED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-005 FOT 62559 048/1757 32330 CDS Equipment problem 03-004 FOT 62559 051/0916 30832 Generic Late Acquisition 03-004 FOT 62601 051/1208 30832 Generic Late Acquisition ANOMALY CLOSURE INFORMATION RECEIVED AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 03-004 FOT 62393 037/1640 30832 Generic Late Acquisition ANOMALY INVESTIGATION REPORTS GENERATED AIR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- -None this report period. OPEN ANOMALY REPORTS AR NO. SUBSYS ORBIT TIME CDS PROBLEM/DATA LOSS ------ ------ ----- ---- --- ----------------- 02-060 FOT 61421 338/0057 N/A PSU Cmd Clock Timeout 03-005 FOT 62559 048/1757 32330 CDS Equipment problem 03-004 FOT 62559 051/0916 30832 Generic Late Acquisition 03-004 FOT 62601 051/1208 30832 Generic Late Acquisition